by Byron Mudry on Jun 20, 2007
After completing the Mana Tombs and adventuring a bit more in Terokkar Forest and Nagrand, you will be ready for the next instance in Auchindoun, The Auchenai Crypts. The Auchenai Crypts are a wing of the the Auchindoun instance that is meant for players level 65-67.
You can find complete details about the instance here: TenTonHammer's Guide to the Auchenai Crypts